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An experiment was designed to compare the lengths of time that four different drugs provided pain...

An experiment was designed to compare the lengths of time that four different drugs provided pain relief after surgery. The results (in hours) follow. Is there enough evidence to reject the null hypothesis that there is no significant difference in the length of pain relief provided by the four drugs at α = .05?

Drug
A    B    C    D   
4 4 9 2
4 4 8 4
6 4 12 2
5 5 9
11

(a) Find the test statistic. (Give your answer correct to two decimal places.)


(ii) Find the p-value. (Give your answer bounds exactly.)
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